A 10 volume manga, also known as Bad Teacher Equation, created by Kodaka Kazuma. It also spawned two OVA.

Atsushi Arisawa enrolls at Jougaouka High School to be near Masami Shibata (Ma-chan), who was his childhood crush. Unbeknownst to Atsushi, however, Masami no longer works at the school and his older brother, Masayoshi is now the nurse. Atsushi mistakes Masayoshi for Masami and is horrified because to him, it appears that Masami's personality has done a complete 180. Add to the fact that Atsushi's friend, Kouji Inagaki is totally in love and constantly trying to make-out with him.

Due to all of this mess, Atsushi's life at Jougaoka is hell... until he starts thinking that maybe the new Ma-chan isn't so bad afterall and that, maybe he actually likes the way Ma-chan is now. Until of course, he finds out that Masayoshi isn't Masami... but after a while, he still ends up falling in love with him for what he is.

This Work Contains Example of:

'80s Hair: Most notably Masayoshi who sports a mullet. Thankfully, Art Evolution kicks in and is not as noticeable in later volumes.

Attempted Rape: Masayoshi, when he was a high school student, was almost raped by the same guy from the OVA that was gonna sexually assault Atsushi.

It turns out that Masami also had an incident like that in the past. He thinks he's "Defiled Forever" and doesn't want to have sex with his boyfriend Tooru due to this.

And almost at the end of the manga, Yuriko almost falls victim to Date Rape during a school tour and Kouji rescues her. It foesgoes into Rescue Romance as that gives them the push to admit their feelings.

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